However I did not follow a tutorial, I wasn't planning to mod that one but since I had leftover thermal pad, decided to give it a try.
Remember how YouTubers made a big deal about the "heat sink is not connected to a fan"? Well, they simply didn't know what they are talking about. The air flows from that heatsink even if the fan is at the other end of the laptop. Which means, you should be careful not to block the airflow when doing the mod. I put a thermal pad that is about half of the size of the heatsink.